Mechanism of selective flocculation of hematite quartz with hydrolyzed polyacrylamide

Jin, Ruiren; Hu, Weibai; Hou, Xianjun

doi:10.1016/0166-6622(87)80124-5

Cited by 24 publications

(7 citation statements)

References 4 publications

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“…However, at that time, behavior of quartz was not studied, due to the supposition of its insignificant contents and role. Some earlier studies showed that hydrolyzed polyacrylamide may be used for selective flocculation of hematite from quartz [25][26][27].…”

Section: Settling With Different S/l Ratios With Additional Flocculanmentioning

confidence: 99%

Comparative Study of the Mineral Composition and Its Connection with Some Properties Important for the Sludge Flocculation Process-Examples from Omarska Mine

Tankosić

Tančić²,

Sredić

et al. 2018

Minerals

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Studied sludge samples are composed of major goethite and quartz; less clay minerals; and minor magnetite, hematite, clinochlore and todorokite. They have quite similar qualitative, but different semi-quantitative compositions. There are similar particle size distributions between the samples, and the highest contents of~50% belongs to the finest classes of <6 µm. Among size classes within the samples, almost identical iron contents are present; indicating their similar mineral compositions, which make these systems very complex for further separation processes. Sludge II has a higher natural settling rate, due to its higher density and mineral composition. With addition of the flocculant, settling rates increase significantly with the increase of the liquid component in both of the samples. The effect of flocculant on the settling rate is different between samples, and depends on their mineral composition. The time of settling does not play a role in selectivity, to the ratio of the mass of floating and sinking parts, and iron content does not change with time. The content of iron partially increases by flocculation; therefore, this method should be considered as an appropriate one. Zeta potential values for sludge are mostly between those for goethite and quartz, indicating their particle mixture and intricately association.

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Section: Settling With Different S/l Ratios With Additional Flocculanmentioning

confidence: 99%

Comparative Study of the Mineral Composition and Its Connection with Some Properties Important for the Sludge Flocculation Process-Examples from Omarska Mine

Tankosić

Tančić²,

Sredić

et al. 2018

Minerals

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show abstract

“…Increasingly, farm high molecular weight polymers are readily adsorbed managers are adopting PAM technology as an effective, to soil particles via electrostatic, hydrogen, and chemical convenient, and economical means of reducing erosion bonding, and by displacement of inner solvation-sphere and improving runoff water quality from furrow-irriwater molecules (LaMer and Healy, 1963; Mortland, gated and sprinkle-irrigated fields. One practice recom-1970;Jin et al, 1987;Malik et al, 1991;Laird, 1997). mended as a Natural Resources Conservation Service As a result, incoming PAM is bound to soil in the upper (NRCS) conservation standard applies 10 mg L Ϫ1 PAM 1 to 5 cm of the profile (Malik et al, 1991).…”

mentioning

confidence: 99%

Fate and Efficacy of Polyacrylamide Applied in Furrow Irrigation

Lentz

Sojka

Mackey

2002

Journal of Environment Quality

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Polyacrylamide (PAM) is applied to 400000 irrigated hectares annually in the USA to control irrigation-induced erosion, yet the fate of dissolved PAM applied in irrigation water is not well documented. We determined the fate of PAM added to furrow streams under two treatments: Initial-10, 10 mg L(-1) PAM product applied only during the initial hours of the irrigation, and Cont-1, 1.0 mg L(-1) PAM product applied continuously during the entire irrigation. The study measured PAM concentrations in 167-m-long PAM-treated furrow streams and along a 530-m tail ditch that received this runoff. Soil was Portneuf silt loam (coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) with 1.5% slope. Samples were taken at three times during the irrigations, both during and after PAM application. Polyacrylamide was adsorbed to soil and removed from solution as the streams traversed the soil-lined channels. The removal rate increased with stream sediment concentration. Stream sediment concentrations were higher when PAM concentrations were <2 mg L(-1) a.i., for early irrigations, and when untreated tributary flows combined with the stream. In these cases, PAM concentration decreased to undetectable levels over the flow lengths used in this study. When inflows contained >6 mg L(-1) PAM a.i., stream sediment concentrations were minimal and PAM concentrations did not change down the furrow, though they decreased to undetectable levels within 0.5 h after application ceased. One percent of applied PAM was lost in tail-ditch runoff. This loss could have been eliminated by treating only the furrow advance or not treating the last two irrigations.

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“…and these techniques could, perhaps, be used to improve the quality of these materials. But due to the very fine nature of the particles selective dispersion or selective [14][15][16][17][18][19][20][21][22][23][24][25][26][27] separation process can be used to upgrade these ultrafine materials so as to make the slimes suitable as blast furnace feed. In view of the utilization of these ultra fines which do not need further size reduction requiring high energy and minimizing environment problem, the present study has been undertaken.…”

Section: Introductionmentioning

confidence: 99%

Effect of mineral geology, mineral size and settling time on selective dispersion and separation process for recovering iron value from iron ultra fines

et al. 2011

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Mechanism of selective flocculation of hematite quartz with hydrolyzed polyacrylamide

Cited by 24 publications

References 4 publications

Comparative Study of the Mineral Composition and Its Connection with Some Properties Important for the Sludge Flocculation Process-Examples from Omarska Mine

Comparative Study of the Mineral Composition and Its Connection with Some Properties Important for the Sludge Flocculation Process-Examples from Omarska Mine

Fate and Efficacy of Polyacrylamide Applied in Furrow Irrigation

Effect of mineral geology, mineral size and settling time on selective dispersion and separation process for recovering iron value from iron ultra fines

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